Apparatus for hardening saw or other steel blades



(No Medel.) 2 Sheets-Sheet. l,

T. S. DXSSTQN. APPARATUS POR HARDENING SAW 0R STEER STEEL BLADES.

MILE

2 Sheets-$heet 2.

No Model.)

. DISSTON.

Y S APPARATUS FOR HARDBNING SAW OR OTHER STB EL BLADES.'

Patented Apr. v9s 1889'.

lis

Va suitable depth with oil lor other hardening- 'on strips la',

the ela-inps in time7 as only one saw at a time can he harrtA @sri "rares THOKAS Si. BISSTON,

APPARATUS FR HARD os Pi-iiLAD-ELrniA, PENNSYLVANIA.

ENiNG SW OR THER STEEL* BLADES.

SPEC'FCATON filming part of .'Letters Patent No. L101,138, dated April 9, 1889.'

Application filed May 18,

To all whom it may concern: s v Be it known that l, THoMAs S. Diss'roN, a .citizen of the United States, residing iu Phiiadelphia, Pennsylvania, have invented ce1'- tain improved Apparatus for Hardening Saw or other Steel Blades, of which the following is a specification. Y

The object of my invention is to thoroughly and quickly harden saw-blades and similar steel plates; and my invention consists in special devices by which the saw-blades are clamped and released from a revolving drum. The revolving drum and clamping devices are broadly claimed in the application filed ou the lith day of May, i888, by Samuel T. Paul for improvements in hardening apparatus for saw-blades, dac. v v

in the accompanying"drawings, liigure''lis a plan vie-W of 'my improved hardening apparatos.V Fig. i? is a transverse section on the line l 2, Fig. l. Fig. 3 is an end view lookingiu the direction of the arrow, Fig. l.; and Fig. i is a section on the line 3 4, Fig. 2.

It is necessary in hardening saws to keep the saw in the oil or other hardening-liquid a certain length of time and under pressure in order to prevent the saw-blades from bucklingwhile in the liquid. rhe common apparat-us for doing this consists of a gisting suspended so as to he dipped` into a tank of oil. On this grating is secured a supplemental grating, which is clamped by hand to. the carrying-grating. The operation of fastening he saw-blade in the elai'nps and then dipping the oil occupies considerable eued. and the price obtained for the sa-Wsdoes not warrant the givingy of sufieienl, time to .theroughlyharden the saws by his @Mmmm l overcome this objection by tire-:devices which l will nowproeeed to deseribe.

A is the task, filled, as shown in Fig. 2, te

liquid, and surrounding this tank is a waterjaeket, a, to keep the oil as cool as possible.

B is a shaft mounted in suitable boxes, o l), l secured to the sides of the tank, i

shown in Fig.

the grated d rum D, having four sides, as sh own in Fig. 2. These sides l will indieate hy the su 0n. the back. of each grid is a shaft, G, mounted on this and rollers l. l, both shaft. length of discontinued l. 0n this shaft .l is mounted iiangerollers Il H are in ktreadle the spring 'are situated opposite said bar, so that hard e n ed evenly and at less. sesame. 274,322. momie.)

numerals l 2-.3 el. The shaft B is driven from the shaft B' through'a pinion, c, and gear- Wheel lc' at one end of the machineL The shaft B is mounted inhearings c2 on one ofy the cross-bars band on the edge of the tank A. 5 5 C is a clutch-sleeve adapted to slide on but free to turn with the shaft B', and is provided With lugs@ e, which engage with stops e' e2, the one on the bearing c2 and the other on the driving-pulley E. This clutch is oper- 6o ated by a treadle, G', through the medium of a 4elutehdever7 C2, pivoted to the tank A. A spring, C3, tends to keep .the clutch-sleeve C always engaged with the bearing o2, and oon-y sequently prevents the shaft B from turning; 6 5 but by depressing the treadle C the clutchsleeve is thrown in gear with the driving-pui# ley E and out-of the notch in the bearing 02;. butv as .soon as the foot is removed from Athe C3 forces the clutch back 7o to its original position. s

Thev sections l 2 3 d of the drum D aremade up of a series of three-cornered bars, d, (shown in cross-section in Fig. 4,) with spaces between the quadranguiar drum D,fand these grids are provided with bars g, bars d of the sections similar'in form to the above referred to, and

A when 8o the saw-blade is placed betweewthe two grids and clamped thereto the edges of the said grids will clamp the blade, .taking up very little of the surface of the blade, so that the oil can penetrate blade, and the blade will consequently be the saine time beheld firmly in position t0 prevent buckling. The hinged grids Fare ogened and closed automatically and arehold closed-while-they are 9o buie rged in the oiliby thejfellowngdevices:

and shaft are flanged rollersllH preferably loose on the The shaft need not extend the full 95 the machine, as shown, but can be in the middle, if necessary. The linelwith cams J J,

extending, as shown in Fie. 2, two-thirds of i Jthe Wav around the cylinder and connected roo to all portions of the 'saw- 85v 35 .cross-bar, bears upon said block M. The ob-4 other side by bolts j.

- p, on a rock-shaft, P, having its bearings on 6o lthen removes his foot from the treadlebefore the cylinder -makes a Afull quarter-turn, sothat vthe lug e on the lcl'utoh'will b e forcedinto` vthe 'recess'. e on the vbearing ".02, and conse 65 the Vproper point. fIn the-meantime' the jaw Fofthesection l hasbeencl'osed. by thecam-f i y Il.

together by longitudinal bars J and 'hung to y and the grid of the section 2 closed, as will also the grid 0f the section 3, while the cam is raised to the position Y my invention.

- possible the oil from y has .been hardened, by being passed through .49

cross-bars b at one side bybolts j and at the Springs 7'2 are interposed between nuts on these bolts and the cross-bars b to allow the cam to yield to accommodate the various thicknesses of blades and to prevent as much as possible the jamming'of 4the saw-blade and the consequent breaking of the parts of the -machine. The cams J are so formed that when the different sections are in position, as shown in Fig. 2,` .the hinged grid F of section l will be open has lost con trol of the grid of section 4, which shown by cams-K K 4acting on `the rollers I I, to allow for the removal. of the hardened saw-blade.

L are adjustable stops adapted tobe clamped to bars L on the back of each grid F. These stops extend through the grid F and into the grids of the drum D and? are adjnstably secured in position by means of a set-screw;I Z, adapted to a slot, Z', in the stop L. By this means the stops can be raised or lowered to accommodate saw-blades of different widths.A The stops L may be'secured in a similar manner to the drum itself without departing from vO11 one of the cross-frames is mounted a spring. clamp-block, M, having a cleaning-surface, m, and under this clamp-block is a block, N, having a cleaning-surface, This clamp-blookM is hinged at m to the crossbar' b', and a spring, M', also secured to the ject of this block is to remove as much as the -saw-blade after it the oil. I The block N is raised by means of a pawl,

the tank A and having an arm, p', connected By pressing upon the treadle block .M down upon thel block N.

'The operation-'of this machine is as follows: The apparatus is so situated in respect to the hardening-furnace that the attendant can insert' the' heatedbladeto be hardened into the open jaw, as s'hown at 1, Fig. 2, immediately upon its removal from the furnace.- As soon a third blade is being'removed from the apcains for raising the movable .stantially as specified.

as thebladeis inserted in the --jaw the attend` ant places his foot upon tha treadle t throws in gear'the operating lmechanism of the'machine, and consequently the drum ,car-l .ryingthe bladeis revolved. The y'operator V quently--stop' the rotation of 'the cylinder at treadle P', raising the clamp-blockMt.. The

sawblade of the section 4 is then inserted between the clamp-block M and the block N.- The attendant then releases his hold on the upon the blade. The saw-blade is then drawn V through the jaws formed by the blocks, the

cleaningsurfaces m and n .removing the oil j from the blade. Thiswork is done simultaneously with the insertion of the new blade' from the fnrnace-' into the jaws of the drum. By the devices labove described whileone blade is being hardened another one isbeing placed in position, and at the same time paratus. j .l Itwill be understood that I do not limit my` self to a quadrangulardrum havil .0 fourgrids, y as more or less than-four may be used without departing from my invention.

1 claim as my'invention. l A

1. lThe combination ofthe tank containing hardening-liquid, a drum .provided with stationary and movable grids, with vcams encir` cling af clamp the vmovable grids to the drum while said grids are in the hardeningliquid, and grids Whenthey emerge 'from the liquid, substantiallyas de'.- scribed.

2. The combination of formed of a series ofgrids with a seriesof grids pivotedfthereto, cams encircling a por; tion of the drum and acting to close the jaws formed by said grids, and fixedv caniswith; which projections on the pivoted gridsj `n-V gage to open said jaws when they. reach a l position above the liquid in the tank, all sub-'.

the tank, its ldrain 43. The combination of the drum and means for rotating the same, said drum havinga series of grids forming jaws adapted to be opened and closed automatically, with a cleaning b10ck and a @reame connected thereto to raise Said biggkf, so that a hardened blade maybe passed from l the grids under the clea11ing-block-when the jaws release said blade, substantially as and for the. purpose set forth.

carrying-a series of jaws with a cam encir; cling a-portion of said drum for closing the jaws,- saidcam having a yielding support'at one or both of its ends, substantially as specified. 5.4The.combination ofthe movable grids 8o treadle,v-allowing the clamp-block M1 to pressj IOO. portion of the drumand acting tol4 f l I2-'3 4, The combination of the tank and a drum 1n testi m ony whereof I have signed my name, In

with an dj ustable step or stops seeuied to to-this specification in the presence of tivo subone of said grids for Supporting the saw-blade,

substantially as described. seribiug witnesses.

6. The combination of the tank, a drum composed of a sei'iee of grids, a series of THOS. S. DISSTON. grids or frames pivote-d thereto, with rollers lar @am acting upon said rollers to clamp ille W'ILLIAM D. CONNER,

Sarrieri by each movable grid, and an annu- Nimes-ses: grids together, substantially as desnribe. HENRY HOWSON. 

